OK, here we go, line by line:
>If your lines are empty, CHECK the 3 way valve in the fuel line, make sure it is operating properly.
:arrow: They seem to be ok. I had a bad one with the 250s and got a real education on how they should be hooked up and working (I got a bad one when I ordered a replacement ... that's another story for anothre time ... I just about never figured it out)
>I would bet if it is, your float needs to be changed.Also, are the carbs stock, aftermarket?If they are stock, CHECK the throat in them- there should be a plastic guide for the slide in there, if it isnt there, the slide will rotate around in the carb, you wont let the bowls fill up with fuel because tyhe slide isnt sitting in the proper location, thus not allowing fuel to go INTO the bowls.
:arrow: Stock carbs on both the 350s and 250s. BTW, these are completely stock except for the air box mod on the 350s and subsequent required jetting changes. I'm pretty competent at rebuilding the carbs and float levels/float valve settings. The plastic guide is in place for all 4 and seem to be doing their job.
>Try this, after they sit for a day or 2, before you start them drain the bowls,if there isnt fuel in there, your float level and float valve are bad.If there is ample fuel in there, REPLACE the 3 way valve and buy a rebuild kit for your pump, there really cheap at partsfish.com or randy at odysseysalvage.com.
:arrow: Again, there is not any fuel in the bowls nor the lines. And, I'm pretty sure all 4 3-way valves are good to go.
>You can also try this as well---afetr sitting, take the fuel line of the carb, CHECK for fuel in the line,if there is thats good, if non try cranking it, the fuel should be there within a couple cranks of the motor,if there isnt ample fuel pressure your pump is bad or as I stated your 3 way valve isnt allowing the fuel to get to your carb and it is just recycling it back to your tank.Also, are your gas caps vents operating properly, a bad cap will cause a condition like this as well, have you checked them out?
:arrow: Now this I haven't tried yet. I suppose the pumps could be bad ... but 4 bad pumps? Seems unlikely but I will CHECK this out with the 350s. Note that all 4 run great once I get them running. As for the bad cap, I had that happen with one of the 250s. Took a long time for me to figure that out ... it would run just fine for about 15 sec to a couple mins and then just quit. Was nice to have spare parts to swap out. I'll CHECK out the 350s caps, though. I would imagine that I could just remove the caps and try cranking them over? My fuel lines are clear, it would be quite obvious I would think.
Thanks for your suggestions, I've lived with the 250s doing this since they were brand new. I just figured the 350s were the same.